package com.atguigu.gulimall.ware.service.impl;

import com.alibaba.fastjson.TypeReference;
import com.atguigu.common.exception.NoStockException;
import com.atguigu.common.to.SkuHasStockVo;
import com.atguigu.common.to.mq.OrderTo;
import com.atguigu.common.to.mq.StockDetailTo;
import com.atguigu.common.to.mq.StockLockedTo;
import com.atguigu.common.utils.PageUtils;
import com.atguigu.common.utils.Query;
import com.atguigu.common.utils.R;
import com.atguigu.gulimall.ware.dao.WareSkuDao;
import com.atguigu.gulimall.ware.entity.WareOrderTaskDetailEntity;
import com.atguigu.gulimall.ware.entity.WareOrderTaskEntity;
import com.atguigu.gulimall.ware.entity.WareSkuEntity;
import com.atguigu.gulimall.ware.feign.OrderFeignService;
import com.atguigu.gulimall.ware.feign.ProductFeignService;
import com.atguigu.gulimall.ware.service.WareOrderTaskDetailService;
import com.atguigu.gulimall.ware.service.WareOrderTaskService;
import com.atguigu.gulimall.ware.service.WareSkuService;
import com.atguigu.gulimall.ware.vo.OrderItemVo;
import com.atguigu.gulimall.ware.vo.OrderVo;
import com.atguigu.gulimall.ware.vo.WareSkuLockVo;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import lombok.Data;
import org.springframework.amqp.rabbit.core.RabbitTemplate;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.util.StringUtils;

import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;


@Service("wareSkuService")
public class WareSkuServiceImpl extends ServiceImpl<WareSkuDao, WareSkuEntity> implements WareSkuService {

    @Autowired
    WareSkuDao wareSkuDao;

    @Autowired
    ProductFeignService productFeignService;

    @Autowired
    WareOrderTaskService orderTaskService;

    @Autowired
    WareOrderTaskDetailService orderTaskDetailService;

    @Autowired
    OrderFeignService orderFeignService;

    @Autowired
    RabbitTemplate rabbitTemplate;

    /**
     * 1.库存自动解锁
     *      下订单成功,库存锁定成功,接下来的业务调用失败,导致订单回滚,之前锁定的库存就要自动解锁.
     * 2.订单失败
     *      锁库存失败
     *
     * 只要解锁库存的消息失败.一定要告诉服务器解锁失败
     */


    private void unLockStock(Long skuId,Long wareId,Integer num,Long taskDetailId){
        //库存解锁
        wareSkuDao.unlockStock(skuId, wareId, num);
        //更新库存工作单的状态
        WareOrderTaskDetailEntity entity = new WareOrderTaskDetailEntity();
        entity.setId(taskDetailId);
        entity.setLockStatus(2);
        orderTaskDetailService.updateById(entity);

    }

    @Override
    public PageUtils queryPage(Map<String, Object> params) {
        QueryWrapper<WareSkuEntity> wrapper = new QueryWrapper<>();
        String skuId = (String) params.get("skuId");
        if (! StringUtils.isEmpty(skuId)){
            wrapper.eq("sku_id",skuId);
        }
        String wareId = (String) params.get("wareId");
        if (! StringUtils.isEmpty(wareId)){
            wrapper.eq("ware_id",wareId);
        }

        IPage<WareSkuEntity> page = this.page(
                new Query<WareSkuEntity>().getPage(params),
                wrapper
        );

        return new PageUtils(page);
    }

    @Transactional
    @Override
    public void addStock(Long skuId, Long wareId, Integer skuNum) {
        //1.判断如果还没有这个库存记录新增
        List<WareSkuEntity> entities = wareSkuDao.selectList(new QueryWrapper<WareSkuEntity>().eq("sku_id", skuId).eq("ware_id", wareId));
        if (entities == null || entities.size() == 0) {
            WareSkuEntity skuEntity = new WareSkuEntity();
            skuEntity.setSkuId(skuId);
            skuEntity.setStock(skuNum);
            skuEntity.setWareId(wareId);
            skuEntity.setStockLocked(0);
            //todo 远程查询sku的名字,如果失败，整个事务无需回滚
            //1.自己catch异常
            //todo 还可以用什么办法让异常出现以后不会滚，高级部分解决
            try {
                R info = productFeignService.info(skuId);
                if (info.getCode() == 0){
                    Map<String,Object> data = (Map<String, Object>) info.get("skuInfo");
                    skuEntity.setSkuName((String) data.get("skuName"));
                }
            } catch (Exception e){
                e.printStackTrace();
            }
            wareSkuDao.insert(skuEntity);
        }else {
            wareSkuDao.addStock(skuId,wareId,skuNum);
        }
    }

    @Override
    public List<SkuHasStockVo> getSkusHasStock(List<Long> skuIds) {
        List<SkuHasStockVo> collect = skuIds.stream().map(skuId -> {
            SkuHasStockVo vo = new SkuHasStockVo();
            //查询当前sku的总库存量
            Long count = baseMapper.getSkuStock(skuId);
            vo.setSkuId(skuId);
            vo.setHasStock(count==null?false:count>0);
            return vo;
        }).collect(Collectors.toList());

        return collect;
    }

    /**
     * 为某个订单锁定库存
     *
     * (rollbackFor = NoStockException.class)
     * 默认只要是运行时异常都会回滚
     *
     * 库存解锁的场景
     * 1)、下订单成功,订单过期没有支付被系统自动取消、被用户手动取消,都要解锁库存
     * 2)、下订单成功,库存锁定成功,接下来的业务调用失败,导致订单回滚,之前锁定的库存就要自动解锁.
     *
     * @param vo
     * @return
     */
    @Transactional(rollbackFor = NoStockException.class)
    @Override
    public Boolean orderLockStock(WareSkuLockVo vo) {

        /**
         * 保存库存工作单的详情
         * 追溯哪个仓库锁了多少库存,用来回滚
         */
        WareOrderTaskEntity taskEntity = new WareOrderTaskEntity();
        taskEntity.setOrderSn(vo.getOrderSn());
        orderTaskService.save(taskEntity);
        //1.按照下单的收货地址，找到一个就近仓库，锁定库存。

        //找到每个商品在哪个仓库都有仓库
        List<OrderItemVo> locks = vo.getLocks();
        List<SkuWareHasStock> collect = locks.stream().map(item -> {
            SkuWareHasStock stock = new SkuWareHasStock();
            Long skuId = item.getSkuId();
            stock.setSkuId(skuId);
            stock.setNum(item.getCount());
            //查询这个商品在哪里有库存
            List<Long> wareIds = wareSkuDao.listWareIdHasSkuStock(skuId);
            stock.setWareId(wareIds);
            return stock;
        }).collect(Collectors.toList());

        Boolean allLock = true;
        //2.锁定库存
        for (SkuWareHasStock hasStock : collect) {
            Boolean skuStocked = false;
            Long skuId = hasStock.getSkuId();
            List<Long> wareIds = hasStock.getWareId();
            if (wareIds == null || wareIds.size() == 0){
                //没有任何仓库有这个商品的库存
                throw new NoStockException("商品id："+skuId+"没有足够的库存了");
            }
            //1.如果每一个商品都锁定成功,将当前商品锁定了纪检的工作单记录发给MQ
            //2.锁定失败.前面保存的工作单信息就回滚了.发送出去的消息,即使要解锁记录,由于去数据库查不到id,所以就不用解锁
            //
            for (Long wareId : wareIds) {
                //成功就返回1,否则就是0
                Long count = wareSkuDao.lockSkuStock(skuId, wareId, hasStock.getNum());
                if (count == 1){
                    skuStocked = true;
                    //TODO 告诉MQ库存锁定成功
                    WareOrderTaskDetailEntity entity = new WareOrderTaskDetailEntity(null,skuId,"",hasStock.getNum(), taskEntity.getId(), wareId,1);
                    orderTaskDetailService.save(entity);
                    //准备发给mq的数据
                    StockLockedTo lockedTo = new StockLockedTo();
                    lockedTo.setId(taskEntity.getId());
                    //只发ID不行,防止前面的数据出现异常回滚后查不到数据
                    StockDetailTo stockDetailTo = new StockDetailTo();
                    BeanUtils.copyProperties(entity,stockDetailTo);
                    lockedTo.setDetail(stockDetailTo);
                    rabbitTemplate.convertAndSend("stock-event-exchange","stock.locked",lockedTo);
                    break;
                }else{
                    //当前仓库锁失败,重试下一个仓库
                }
            }
            if (!skuStocked){
                //当前商品所有仓库都没有锁住
                throw new NoStockException("商品id："+skuId+"没有足够的库存了");
            }
        }
        //3.肯定全部都是锁定成功过的


        return true;
    }

    @Override
    public void unlockStock(StockLockedTo to) {

            StockDetailTo detail = to.getDetail();
            Long detailId = detail.getId();
            //解锁
            //1.查询数据库库关于这个订单的锁定库存信息
            //有:证明库存锁定成功了
            //      解锁:订单情况
            //          1.没有这个订单.必须解锁
            //          2.有这个订单.不是解锁库存
            //              订单状态:
            //                  已取消:解锁库存
            //                  没取消:不能解锁
            //没有:库存锁定失败了,库存回滚了,这种情况无需解锁
            WareOrderTaskDetailEntity byId = orderTaskDetailService.getById(detailId);
            if (byId != null) {
                //解锁
                Long id = to.getId();//库存工作单的ID
                WareOrderTaskEntity taskEntity = orderTaskService.getById(id);
                String orderSn = taskEntity.getOrderSn();//根据订单号查询订单的状态
                R r = orderFeignService.getOrderStatus(orderSn);
                if(r.getCode() == 0){
                    //订单数据返回成功
                    OrderVo data = r.getData(new TypeReference<OrderVo>() {
                    });
                    if (data == null||data.getStatus() == 4) {
                        //订单不存在或者订单已经被取消,才能解锁库存
                        if (byId.getLockStatus() == 1){
                            //当前库存工作单详情,状态1 已锁定但是未解锁才可以解锁
                            unLockStock(detail.getSkuId(), detail.getWareId(), detail.getSkuNum(), detailId);
                        }

                    }

                }else {
                    //消息拒绝以后重新放到队列里面,让别人继续消费解锁
                    throw new RuntimeException("远程服务失败");
                }
            }else{
                //无需解锁
            }
        }

    //防止订单服务卡顿,导致订单状态消息一直改不了,库存消息优先到期,差订单状态新建状态,什么都不做就走了
    //导致卡顿的订单,永远不不能解锁库存
    @Override
    public void unlockStock(OrderTo orderTo) {
        String orderSn = orderTo.getOrderSn();
        //查一下最新库存的状态,防止重复解锁库存
        WareOrderTaskEntity task = orderTaskService.getOrderTaskByOrderSn(orderSn);
        Long id = task.getId();
        //按照工作单找到所有没有解锁的库存，进行解锁
        List<WareOrderTaskDetailEntity> entities = orderTaskDetailService.list(
                new QueryWrapper<WareOrderTaskDetailEntity>()
                        .eq("task_id", id)
                        .eq("lock_status", 1));
        for (WareOrderTaskDetailEntity entity : entities) {
            unLockStock(entity.getSkuId(),entity.getWareId(),entity.getSkuNum(),entity.getId());
        }

    }

}

    @Data
    class SkuWareHasStock{
        private Long skuId;
        private Integer num;
        private List<Long> wareId;
    }